Generate Aes 256 Key Openssl
OpenSSL is a powerful cryptography toolkit that can be used for encryption of files and messages.
The generated files are base64-encoded encryption keys in plain text format. If you select a password for your private key, its file will be encrypted with your password. Be sure to remember this password or the key pair becomes useless. The private.pem file looks something like this. In this case SHA-256. Generate a SSL Key File. Firstly you will need to generate a key file. The example below will generate a 2048 bit key file with a SHA-256 signature. Openssl genrsa -out keyname.key 2048. If you want extra security you could increase the bit lengths. Openssl genrsa -out keyname.key 4096. Apr 27, 2016 Encrypt data using AES and 256-bit keys AES stands for Advanced Encryption Standard and is an industry-standard algorithm for encrypting data symmetrically which even the US government has approved for SECRET documents. May 30, 2017 $ openssl enc -aes-256-cbc -kfile passphrase -md md5 -P -salt salt=51D9C4B24C759179 key=BBF4EA0E7A0EBD7C60CCE2024E218A53BBB69CCA65B4D0B76E5F5D iv =8E5EC1AC2191167DF9B753BA93A1E7B8. 其中的 salt 是随机生成的，因此每次执行的结果并不相同。而 Key 和 IV 的生成方法参考 SuperUser 的一个回答补充及验证如下（注意 md5sum 输出的结果与上述 openssl 命令的输出结果比较）：. $ openssl list-cipher-algorithms The output gives you a list of ciphers with its variations in key size and mode of operation. For example AES-256-CBC for AES with key size 256 bits in CBC-mode. Some ciphers also have short names, for example the one just mentioned is. Each utility is easily broken down via the first argument of openssl. For instance, to generate an RSA key, the command to use will be openssl genpkey. Generate 2048-bit AES-256 Encrypted RSA Private Key.pem. The following command will result in an output file of private.pem in which will be a private RSA key in the PEM format.
If you want to use the same password for both encryption of plaintext and decryption of ciphertext, then you have to use a method that is known as symmetric-key algorithm.
From this article you’ll learn how to encrypt and decrypt files and messages with a password from the Linux command line, using OpenSSL.
HowTo: Encrypt a File
| Options | Description |
|---|---|
| openssl | OpenSSL command line tool |
| enc | Encoding with Ciphers |
| -aes-256-cbc | The encryption cipher to be used |
| -salt | Adds strength to the encryption |
| -in | Specifies the input file |
| -out | Specifies the output file. |
Openssl Aes Example
Interesting fact: 256bit AES is what the United States government uses to encrypt information at the Top Secret level.
Warning: The -salt option should ALWAYS be used if the key is being derived from a password.
Without the -salt option it is possible to perform efficient dictionary attacks on the password and to attack stream cipher encrypted data.
When the salt is being used the first eight bytes of the encrypted data are reserved for the salt: it is generated at random when encrypting a file and read from the encrypted file when it is decrypted.
Openssl Enc Aes 256 Cbc
HowTo: Decrypt a File
| Options | Description |
|---|---|
| -d | Decrypts data |
| -in | Specifies the data to decrypt |
| -out | Specifies the file to put the decrypted data in |
Base64 Encode & Decode
Base64 encoding is a standard method for converting 8-bit binary information into a limited subset of ASCII characters.It is needed for safe transport through e-mail systems, and other systems that are not 8-bit safe.
By default the encrypted file is in a binary format.
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If you are going to send it by email, IRC, etc. you have to save encrypted file in Base64-encode.
Cool Tip: Want to keep safe your private data? Create a password protected ZIP file from the Linux command line. Really easy! Read more →
To encrypt file in Base64-encode, you should add -a option:
| Option | Description |
|---|---|
| -a | Tells OpenSSL that the encrypted data is in Base64-ensode |
Option -a should also be added while decryption:
Non Interactive Encrypt & Decrypt
Warning: Since the password is visible, this form should only be used where security is not important.
By default a user is prompted to enter the password.
If you are creating a BASH script, you may want to set the password in non interactive way, using -k option.
Cool Tip: Need to improve security of the Linux system? Encrypt DNS traffic and get the protection from DNS spoofing! Read more →
Public key cryptography was invented just for such cases.
Openssl Generate Aes 256 Key
Encrypt a file using a supplied password:
Openssl Decryption Aes
Decrypt a file using a supplied password: